Mechanical movement



' March 17. 1925.

J. HENSLEY MECHANICAL MOVEMENT Filed Aug; 10 ,8

gvvuu vboz JOHN HENSLEY,

Patented Mar. 17, 1925.

UNITED STATES MECHANICAL MOVEMENT. I

Application filed August 10., 1922; 'Serial No. 580,994. i

To all whom z't may concern:

Be itknown' that 1, JOHN HnNsLnY, a citizen of the'United States, residing at Burbank, in the county of Los Angeles and State of California, have invented new and useful Improvements in Mechanical Movements, of which the following is a specification.

My invention relates to steam engines, and more particularly to the relative positions of the piston. and the crank pin when at the center of travel of their respective stroke and throw, due to the angularit-y of the connecting rod.

In steam engine construction most engines are built with connecting rods of short length as compared with the length of the piston stroke. F or this reason, when, the crank pin is turning above the crank shaft a-ndtoward the cylinder the piston will not have reached the center of its stroke when the crank pin reaches the upper center of its throw at a right angle tothe start there of or vertically above the crank shaft, center, so that at the time the crank pin has moved to the vertical center line of the crank shaft the piston will have been moved to a position less than the center of its stroke, and therefore has not traveled a distance half its stroke. After the crank pin has continued and completed its throw the piston has been moved the remainder of its stroke which is more than the first part of the stroke. By comparison it will be seen that a variation exists between the correshow the position of the wrist sponding centers of the piston stroke and the crank throw and on the return throw the relative, difference in length of trtvel is son'lcwhat reversed 'due to the angularity of the connecting rod. i

The principal object of my invention is to overcome and'correct the angularity; of the connecting rod causing a. relative variation in. the piston stroke as compared with the crank throw to their respective positions when at the centers of the length of stroke and throw in either direction of travel pointed out in the foregoing explanation.

Another object is to accomplish the principal object with positive means adapted to automatically cause the piston to be evenly and gradually accelerated in the travel,v to

the center of its stroke from one end cylinder or retard its travel'from the other end so that the crank pin and piston will arrive at their respective centers of, throw.

either direction; v I

Another object is to so placerthe parts causing the increased throw that they are arranged to form in a substantially direct and stroke simultaneously when traveling in alignmenta-t the time halfthe throw of the crank pin has taken place as at this point it -1S believed the greatest stress to the parts is encountered.

, 'With the foregoing and other obiectsin view ny invention consists incertain novel features of construction and arrangement of parts that will be hereinafter more fully described andclaimed and illustrated in the accompanying drawings in which:

Figure 1, is a. side elevational; view with parts broken away and shown in section of a stationary reciprocating type of steamengine provided with my stroke correcting device. p I

Fig. 2, is a horizontal sectional detail View on the line 22 of Fig. 1', showing the cross head construction. f I

Fig. 3, is'a fragmentary side elevational view of the cross head connecting parts.

Fig. 4, is a diagram partly in section to show the relative position of'the wrist pin at the completion of a stroke as shown in Fig.1., t,;.

Fig. 5, is adiagram partly in section to pin. at the ends of the returnstroke. 1

Referring to the drawing, more specifically G-indioates a conventional. stationary horizontal reciprocating type of steam en gine in which 7 is the cylinder with a piston I 8 and piston rod 9 slidably mounted, therein,

the cylinderbeingmounted one end. of a bed plate 10 and at the other: end of which is crank shaft 11 rotatably journaled in bearings 12. A crank pin 13 is fixed to the crank shaft 11 on which a-eonnecting rod 14 is pivotally secured. Substantially midway the cylinder 7 and crankshaft 11 a:

cross head 15 is slidingly mounted in guides 16. The connection for the piston rod 9' connecting rod 14 and cross head 15 is efeccentricity to equal the difference on account of angularity.

Obviously various changes in the construction may he made coming Within the scope of the appended claims.

I claim:

1. The combination with a steam engine, having a reciprocating piston and rod, a crosshead, a crank shaft provided With a crank pin, a connecting rod, a Wrist pin adapted to connect the piston rod, crosshead and connecting rod, of means fixed to the wrist pin for causing the piston to reach its center of stroke at the time the crankpin reaches the vertical center of its throw.

2. In an engine, a reciprocating piston and piston rod, a crosshcad connected to the piston rod, a crank shaft and connecting rod, a

Wrist pin on the. cross head, an eccentric conmeeting the wrist pin and connecting rod, and means operable on reciprocation of the cross head for rotating the wrist pin and eccentric whereby the piston will be caused to reach its center of stroke when the crank shaft reaches the vertical center of its throw.

3. In an engine, having a reciprocating piston and piston rod, a cross head connected to the piston rod, a crank shaft, a connecting rod between the crank shaft and cross head, a Wrist pin. on the cross head, an eccentric connecting the Wrist pin and 0011- necting rod, a gear fixed on the Wrist pin, and a gearrack engaged by said gear Whereby reciprocation of the cross head will effect oscillation of said Wrist pin and eccentric.

JOHN HENSLE Y. 

